模型石膏的制备性能及应用研究
重庆大学硕士学位论文
论文题目:模型石膏的制备、性能及应用研究
论文作者:李青
摘要
我国陶瓷工业大多还在沿用大量的石膏模具，但是石膏材料的强度较低，耐水性差，吸水性不好，耐溶蚀性差(主要是泥浆的腐蚀)，表面硬度低，耐磨性差，所以这种石膏模的使用次数不高，有时还不能满足成形工艺的要求。对卫生洁具来说，一般只有60-80次，最长也只有100次。
针对以上模型石膏存在的问题，本课题首先采用天然建筑石膏作为模用石膏粉，分析了外加剂对模型石膏的改性作用:然后协同研究了不同种类的石膏、石膏不同相混合以及石膏细度变化对模型石膏性能的影响。考虑到陶瓷工业对石膏模具的特殊要求，本文选用多种外加剂如缓凝剂、减水剂、增强剂、防水剂、耐蚀剂、增强剂、消泡剂及一些耐磨填料进行一系列实验，通过比较其对模型石膏重要指标如流动性、膨胀率、耐蚀性、防水性、强度等的影响，分别找出对模型石膏改性效果较好的外加剂及其掺量;通过不同种类、石膏的不同相混合对模型石膏的影响，得出模型石膏性能较好的不同种类石膏、石膏不同相之间的配比;通过石膏细度变化对模型石膏性能的影响作用，找出模型石膏性能最好的细度范围;并推测它们工作原理，最后，通过对石膏硬化体晶体扫描电镜照片的观测，从微观的角度解释卜述各因素对模型石膏的影响作用。然而，上述各种因素对模型石膏影响机理是个复杂而值得探讨的问题，深入到分子结构和化学反应的原理仍需多种微观实验来进行进一步的研究。
国外现在普遍采用α－半水石膏与β-半水石膏混合制成石膏模型，而我国都还普遍采用β半水石膏为原材料，且各项性能指标都较低。我们对价格较低的β-半水石膏粉进行各项改性研究，希望以此为基础，再探讨α-半水石膏与天然建筑石膏、α-半水石膏与脱硫石膏混合以及生石膏与天然建筑石膏、无水石膏与天然建筑石膏混合对模型石膏的影响，还讨论了石膏细度对模型石膏的影响，所有的研究结果对我国陶瓷产业的发展有一定的借鉴意义。
关键词:模型石膏，外加剂，膨胀率，晶体形貌，细度
AB S TRAC T
Many porcelain industries continues to use gypsum module，but gypsum module also has many shortcomings, such as: low intension, bad water resistence, bad water absorbing, bad wearability resistence and denudation resistence，low surface rigidity.
So the use times of gypsum module is not as long as to meet the need of moulding technical. For example, as to sanitation utensile, the use times is sixty to eighty normally, at best only one hundred.
In this study, relative theory such as the influence of admixture on modle gypsum,the influence of different gypsum and different states of gypsum on modle gypum, the influence of finess of gypum on modle gypsum is systemically analyzed. Taking the special requinnent of porcelain industries to modle gypsum into account, a lot of admixtures suca as retarder, water reducers, water maintenance, waterproof and filling are used, through comparing the influence of them on the important indexs of gypsum,it is to find the better percentage of better admixtures and fillingand to presume the influence mechanism, the important indexs of gypsum are fluxion, strength, water resistence, wearability resistence and percentage of expansion.Through comparing the influence of different gypsum and different states of gypsum and fmess of gypum on modle gypsum, it is to find the better percentage of different gypsum and different states of gypsum and find better range of the finess of gypsum. At last, the crystal morphology makes us known the influence of each factor on the modle gypsum. The action mechanism is a very complex problems and worth to be discussed deeply, and the
moledecular structure of resultant and the theory of chemical reaction need to be further
investiged.
Gypsum moulded that maded by α-gypsum and β-gypsum is at large used in other countries, but our county still use β gypsum and the indexs of gypsum are very low. In this study, α gypsum used in gypsum moulde is studied so as to study further the influence of a gypsum and plaster, α gypsum and desulphurization gypsum，raw gypsum and gpsum and anhydrite with gypsum on modle gypsum. All conclusions are developmental to the development of porcelain industry.
Keywords: modle gypsum, admixture，expansion rate, crystal morphology,finess
重庆大学硕士学位论文
论文题目:模型石膏的制备、性能及应用研究
论文作者:李青
摘要
我国陶瓷工业大多还在沿用大量的石膏模具，但是石膏材料的强度较低，耐水性差，吸水性不好，耐溶蚀性差(主要是泥浆的腐蚀)，表面硬度低，耐磨性差，所以这种石膏模的使用次数不高，有时还不能满足成形工艺的要求。对卫生洁具来说，一般只有60-80次，最长也只有100次。
针对以上模型石膏存在的问题，本课题首先采用天然建筑石膏作为模用石膏粉，分析了外加剂对模型石膏的改性作用:然后协同研究了不同种类的石膏、石膏不同相混合以及石膏细度变化对模型石膏性能的影响。考虑到陶瓷工业对石膏模具的特殊要求，本文选用多种外加剂如缓凝剂、减水剂、增强剂、防水剂、耐蚀剂、增强剂、消泡剂及一些耐磨填料进行一系列实验，通过比较其对模型石膏重要指标如流动性、膨胀率、耐蚀性、防水性、强度等的影响，分别找出对模型石膏改性效果较好的外加剂及其掺量;通过不同种类、石膏的不同相混合对模型石膏的影响，得出模型石膏性能较好的不同种类石膏、石膏不同相之间的配比;通过石膏细度变化对模型石膏性能的影响作用，找出模型石膏性能最好的细度范围;并推测它们工作原理，最后，通过对石膏硬化体晶体扫描电镜照片的观测，从微观的角度解释卜述各因素对模型石膏的影响作用。然而，上述各种因素对模型石膏影响机理是个复杂而值得探讨的问题，深入到分子结构和化学反应的原理仍需多种微观实验来进行进一步的研究。
国外现在普遍采用α－半水石膏与β-半水石膏混合制成石膏模型，而我国都还普遍采用β半水石膏为原材料，且各项性能指标都较低。我们对价格较低的β-半水石膏粉进行各项改性研究，希望以此为基础，再探讨α-半水石膏与天然建筑石膏、α-半水石膏与脱硫石膏混合以及生石膏与天然建筑石膏、无水石膏与天然建筑石膏混合对模型石膏的影响，还讨论了石膏细度对模型石膏的影响，所有的研究结果对我国陶瓷产业的发展有一定的借鉴意义。
关键词:模型石膏，外加剂，膨胀率，晶体形貌，细度
AB S TRAC T
Many porcelain industries continues to use gypsum module，but gypsum module also has many shortcomings, such as: low intension, bad water resistence, bad water absorbing, bad wearability resistence and denudation resistence，low surface rigidity.
So the use times of gypsum module is not as long as to meet the need of moulding technical. For example, as to sanitation utensile, the use times is sixty to eighty normally, at best only one hundred.
In this study, relative theory such as the influence of admixture on modle gypsum,the influence of different gypsum and different states of gypsum on modle gypum, the influence of finess of gypum on modle gypsum is systemically analyzed. Taking the special requinnent of porcelain industries to modle gypsum into account, a lot of admixtures suca as retarder, water reducers, water maintenance, waterproof and filling are used, through comparing the influence of them on the important indexs of gypsum,it is to find the better percentage of better admixtures and fillingand to presume the influence mechanism, the important indexs of gypsum are fluxion, strength, water resistence, wearability resistence and percentage of expansion.Through comparing the influence of different gypsum and different states of gypsum and fmess of gypum on modle gypsum, it is to find the better percentage of different gypsum and different states of gypsum and find better range of the finess of gypsum. At last, the crystal morphology makes us known the influence of each factor on the modle gypsum. The action mechanism is a very complex problems and worth to be discussed deeply, and the
moledecular structure of resultant and the theory of chemical reaction need to be further
investiged.
Gypsum moulded that maded by α-gypsum and β-gypsum is at large used in other countries, but our county still use β gypsum and the indexs of gypsum are very low. In this study, α gypsum used in gypsum moulde is studied so as to study further the influence of a gypsum and plaster, α gypsum and desulphurization gypsum，raw gypsum and gpsum and anhydrite with gypsum on modle gypsum. All conclusions are developmental to the development of porcelain industry.
Keywords: modle gypsum, admixture，expansion rate, crystal morphology,finess
